| 引用本文: | 张姝,何正友,林圣,等.基于充放电暂态特征的谐振接地系统单相接地故障定位方法[J].电力系统保护与控制,2013,41(9):13-20.[点击复制] |
| ZHANG Shu,HE Zheng-you,LIN Sheng,et al.Fault location based on charge and discharge transient characteristic of the single-phase fault in the resonant grounding system[J].Power System Protection and Control,2013,41(9):13-20[点击复制] |
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| 摘要: |
| 在配电网的谐振接地系统中，如果线路发生单相接地故障会在故障暂态中呈现充电和放电现象。对此故障暂态现象进行了深入分析，将充放电暂态特征引入到配电网单相接地故障定位算法中。在35 kV经消弧线圈接地的3馈线配电网拓扑模型的基础上，仿真分析了故障暂态的频率特征，将故障暂态频率分为充电频率和放电频率。其中，充电过程中包含的充电频率理解为对RLC线路充电所形成，而放电过程中包含的放电频率则理解为类似故障行波在线路中传播形成的固有频率。考虑到配电网馈线存在较大干扰，放电频率提取较困难，采用充电暂态特征与放电频率特征相 |
| 关键词: 谐振接地系统 单相接地故障 充电频率 放电频率 故障测距 |
| DOI：10.7667/j.issn.1674-3415.2013.09.003 |
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| 基金项目: |
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| Fault location based on charge and discharge transient characteristic of the single-phase fault in the resonant grounding system |
| ZHANG Shu,HE Zheng-you,LIN Sheng,SHANG Wu-jun |
| () |
| Abstract: |
| In the resonant grounding system of distribution network, it will present charging and discharging phenomena in fault transient when there is a single phase-to-earth fault. This paper makes an in-depth analysis about this fault transient phenomenon, and introduces a fault location method of single phase-to-earth fault in distribution system based on charging and discharging transient characteristics. On the basis of the model, i.e. a topology of distribution network which has three feeders in 35 kV grounded fault via arc-distinct coil, this paper analyzes the frequency characteristics of fault transient by simulation, and the frequency is divided into charging and discharging frequency. Among them, the charging frequency contained in the charging process is interpreted as that it is formed by charging for RLC circuit, and the discharging frequency in the discharging process can be explained as inherent frequency which is similar to that formed in fault wave propagation in the line. Considering the disturbance of many feeders in distribution network, it is difficult to extract discharge frequency, so this research uses a comprehensive location algorithm combining the charging transient characteristics and discharging frequency characteristics. Its efficiency is verified by numbers of operating tests on different distances in the feeder, different grounding resistances and different initial phase angles. |
| Key words: resonant grounding system single-phase-to-earth fault charge frequency discharge frequency fault location |
